Two cones have height volumes in the ratio 3 : 1 and their heights are in the ratio 1 : 3, then the ratio of their radius is
1 : 3
1 : 9
3 : 1
3 : 1
C.
3 : 1
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The radius and height of a cylinder are in the ratio 5:7 and its volume is 550 cm3. Find its radius.
Let radius (r) = 5x and height (h) = 7x. Now. Volume = 550
x = 1 ∴ The required radius = 5x = 5 x 1 = 5cm.
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A hemisphere of lead of radius 8 cm is cast into a right circular cone of base radius 8 cm. Determine the height of the cone, correct to two places of decimals.